JPS63244210A - Temperature display device - Google Patents

Abstract

PURPOSE:To reduce the cost, and also, to obtain a simple display design by displaying a detected temperature and a set temperature by one indicator. CONSTITUTION:The titled device is provided with a thermistor 1 for detecting a temperature, a volume 4 for setting a temperature, a first indicator 16 for displaying a detected temperature and a set temperature, a second indicator 17 for indicating the display contents by interlocking with the display contents of the first indicator 16, a display switch 13 for switching the contents outputted to the first indicator 16, a time 9 which is initialized whenever an operation for setting a temperature is executed and starts a counting operation, and a comparator 11 for comparing a count value of the timer 9 with a prescribed value, and inverting an output, when said value becomes the prescribed value, and by an output signal of the comparator 11, a display of the display switch 13 is switched. In such a way, since the display contents are indicated by the second indicator 17, a confirmation of the display contents of that time more convenient, and also, a confirmation error can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature display device used in temperature control devices for heating appliances, etc.

BACKGROUND TECHNOLOGY In general, devices that set a temperature and attempt to control the temperature are always equipped with a temperature setting section and a temperature detection section, but they do not necessarily display the detected temperature.

Further, when displaying both the set temperature and the detected temperature, two displays are used to display each individual display, or only one of them is selectively displayed.

For example, in a conventional temperature display device, as shown in FIG. Temperature setting unit 1 is formed by connecting a suitable resistor 104 for voltage limiting to the other end and a suitable resistor 105 for voltage limiting to the other end.
11, the signal from the temperature detection section 110 is connected to the contact 1osa, and the signal from the temperature setting section 111 is connected to the contact 1o6b. A mu/D converter 112 that converts an analog voltage into a digital quantity is connected to a switch 107 whose output is connected to a common terminal, and a contact 107& of the switch 107 to convert the detected temperature into a two-digit day. The display unit 113 is composed of a display 108 that displays numbers in the shape of a square, and a display 109 that is connected to the contact 107b of the switch 107 and displays a set value.

The operation of the above configuration is that when the switch 108 is on the 106&contact side, the switch 107 is also connected to the 1072&contact side, and when the switch 106 is on the 106b contact side, the switch 107 is also connected to the 1072&contact side.
The switch 106 and the switch 10γ are interlocked so that they are connected to the 07b contact side. In other words, the M/D converter 112
The voltage v1 corresponding to the detected temperature and the voltage v2 corresponding to the set temperature are alternately input while switching at high speed with the switch 106 and converted into a digital quantity.
The detected temperature is outputted to the display 108 and the set temperature is outputted to the display 109 through the switch 107 synchronized with the switch 107, so that both the detected temperature and the set temperature are displayed.

As another conventional example, when displaying both the detected temperature and the set temperature on one display, switch 1 in Fig. 6 is used.
This was achieved by manually switching the 14 switches instead of automatically.

Problems to be Solved by the Invention However, in the conventional configuration, two displays, one for the detected temperature and one for the set temperature, are used to display the same temperature even though there is a difference between the detected temperature and the set temperature. It would be wasteful to do so, and it would increase costs. ``Additionally, simple display designs are preferred in recent consumer devices, and from that point of view, two displays give a cluttered feel and require a lot of installation space. was there.

Furthermore, in the case of a single display, it is inconvenient to only know either the detected temperature or the set temperature, and switching manually is even more troublesome and impractical. Furthermore, if the user is left to decide whether the current display is the detected temperature or the set temperature based on the state of the switch, there is a risk of misjudgment.

The present invention solves this conventional problem by displaying both the detected temperature and the set temperature on a single display, and also automatically switching the display by determining the status of the setting operation. This is the purpose.

Means for Solving the Problems In order to achieve the above object, the temperature display device of the present invention includes a first display that displays a detected temperature and a set temperature, and a display that displays the display content in conjunction with the display content of the first display. a second display for instructing, a display switch for switching the content output to the first display, a timer that is initialized and starts counting each time a temperature setting operation is performed, and a count value of the above-mentioned timer and a predetermined value. The present invention includes a comparator that compares the value with a predetermined value and inverts the output when a predetermined value is reached, and the output signal of the comparator causes the display switching device to switch the display.

Effect of the Invention According to the present invention, both the detected temperature and the set temperature can be displayed on one display with the above-mentioned configuration, thereby reducing costs and making it possible to have a simple display design. Moreover, the detected temperature is usually displayed, and when the temperature setting operation is performed, the set temperature is displayed, and if the temperature setting operation is not performed for a certain period of time, it will automatically return to the original detected temperature. This greatly improves usability.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

In FIG. 1, 1 is a thermistor for temperature detection, and 2 is its voltage dividing resistor. Reference numeral 4 is a volume for temperature setting, and the pressure is appropriately divided between resistors 3 and 6. 6 and 7 are Mu/D converters that convert the input analog voltage into a digital quantity and output it. The MU/D converter 6 converts the voltage at the connection point between the thermistor 1 and the resistor 2, which outputs a temperature signal, into a digital quantity and outputs it to the signal line e as detected temperature information. Man/
The D converter 7 inputs the voltage at the movable terminal of the temperature setting volume 4, converts it into a digital quantity, and outputs the result to the signal line f as set temperature information. On the other hand, the voltage at the movable terminal of the volume 4 is also input to the differentiating circuit 8. The differentiating circuit 8 detects a change in the input voltage, that is, the operation of the volume 4, and outputs a tJ'' signal while the input voltage changes.

9 is input with the output signal C of the differentiating circuit 8, and the oscillator 1
This is an increment type timer that uses o as the clock source, and stops when the count value reaches the highest value. Further, when the output signal C becomes "L", the count value returns to 0, and when the output signal C becomes "H", counting is started.

A comparator 11 outputs the result of comparing the output of the timer 9 and the value of the fixed value setter 12. For example, if the value of the fixed value setter 12 is currently set to 3 seconds, if the output value of the timer 9 is less than 3 seconds, it will output a "L"H" signal, and if it is 3 seconds or more, it will output an H" signal. The display switch 13 connects the signal line connected to the output signal line d with either the signal line e or the signal line f. “L It
When , connect signal line f and signal line d, tl )l It
In this case, the signal line e and the signal line d are connected. Reference numeral 14 is a two-digit numerical display expressed by Japanese character-shaped numerals, and reference numeral 16 is a display content indicator consisting of a detected temperature indicator 16 & consisting of I and KD and a set temperature indicator 1.

The LICD block 16 indicates the detected temperature when the detected temperature indicator 16& is lit, and indicates the set temperature when the set temperature indicator 16b is lit. 16& is a first driver for the number display 14, which together with the number display 14 constitutes the first display 16, and includes a decoder for converting a digital signal into a corresponding LICD lighting pattern. 17& is a second driver for the display content indicator 5, which lights the detected temperature indicator 15& when the output signal of the comparator 11 is H'';
4L'', the set temperature indicator 15b is turned on and together with the display content indicator 15 constitutes a second indicator 17.

Next, the operation of the above configuration will be explained using the timing chart shown in FIG. Now set the detection temperature of thermistor 1 to 20'C.
Assume that the set temperature is 18° C., the number display 14 indicates "2o", and the detected temperature indicator 151L is lit. When the volume 4 is operated to change the set temperature from 18°C to 22°C, the change in voltage v1 is captured and the output signal C of the differentiating circuit 8 becomes tt L 11 (point A). This initializes the timer 9 and sets the count value to the fixed value setter 1.
Since it is less than the value of 2 (3 seconds), it is set to zero. As a result, the comparator 11 outputs L'', so the signal line d is connected to the signal line f by the display switch 13. Therefore, the number display 14 displays "18" to "22" and at the same time the display content indicator The lighting of 15 changes from 152L to 15b to indicate that the set temperature is reached. When the operation of the volume 4 is stopped when the set temperature is set to 22°C, the output signal C of the differential circuit returns to "H", and from this point on, the counting operation of the timer 9 proceeds (4 points).The count of the timer 9 When the value exceeds the equivalent of 3 seconds, the output of the comparator 11 returns from ``L'' to ``H'', so the signal line d is connected to the signal line 0. Therefore, the number display 14 displays the detected temperature of ``2o''. At the same time, the lighting of the display content indicator 15 changes from 15b to 15&, indicating that the detected temperature has been reached (point 6). If the setting of volume 4 is changed continuously without stopping for more than 3 seconds as shown in point 1, the output of comparator 11 will be
It continues as L''.

The above embodiment uses the volume 4 as the temperature setting device, but as another embodiment, two non-locking switches 181L and 18b for setting the increasing direction and decreasing direction may be used as shown in FIG. In this case, a change in the set temperature is often detected by a detection circuit 19 consisting of a monostable flip-flop operated by an edge signal. Also, counter 23
is a counter that increases or decreases each time SWIN-F182L and 18b are pressed, and the value indicates the set temperature.

Further, FIG. 4 shows the fixed value setter 1 in the embodiment of FIG.
In another embodiment, the value of 2 can be varied with the volume 20, and the variable range is limited to 2 seconds to 5 seconds with the resistors 21 and 22. If the value on the fixed value setter 12 is less than 2 seconds, it will return to the detected temperature display soon after confirming the changed setting value, making it very difficult to read.On the other hand, if it takes longer than 5 seconds, the user will feel irritated. When trying to express two types of content on one display, the timing of responses subtly affects usability, which is extremely important and at the same time shows individual differences. This limit value is lower limit 2 seconds and upper limit 6 seconds
Seconds. 23 is a MU/D converter which converts the voltage obtained by the volume 2o into a digital quantity and sets it in the fixed value setter 12.

All of these configurations can also be performed by the microcomputer 24 and can be easily realized with a program.

Effects of the Invention As described above, according to the temperature display device of the present invention, both the detected temperature and the set temperature can be displayed on one display, and the configuration can be simplified. In addition, since the timer count is initialized each time a setting operation is performed, the set temperature is displayed during the setting operation, and after a certain confirmation period after the operation is completed, the original detected temperature is displayed, greatly improving usability. At the same time, the display contents are changed to the second one according to the temperature display contents of this detection and setting.
Since instructions are given on the display, confirmation of the displayed contents at that time becomes more convenient, and confirmation errors can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the temperature display device of the present invention, FIG. 2 is a waveform diagram of each part of the device, and FIGS. 3 and 4 are IF diagrams showing other embodiments. , FIG. 6, and FIG. 6 are block diagrams showing a conventional example. 1...Thermistor for temperature detection (temperature detection means), 4...Volume for temperature setting (temperature setting means), 6 and 7...Mom/D converter , 8...
...Differential circuit, 9...Timer, 11...
... Comparator, 13 ... Display switch, 16.
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Claims (3)

[Claims] (1) A temperature detection means for detecting temperature, a temperature setting means for setting an arbitrary temperature, a first display for numerically displaying the detected and set temperature, and an initial display each time the temperature setting means is operated. a timer that starts counting the timer, a comparator that compares the value of the timer with a predetermined value, and an output of the comparator that normally outputs the temperature detected by the temperature detection means to a first display; a display switching device that changes the output content to the set temperature and outputs it to the first display until the timer reaches a predetermined value after the temperature setting means is operated; A temperature display device comprising: a second indicator that changes instruction content in conjunction with the display content indicated by the second indicator. (2) The temperature display device according to claim 1, wherein the predetermined value to be compared with the timer value by the comparator can be varied. (3) The temperature display device according to claim 2, wherein the variable range of the predetermined value to be compared with the value of the timer by the comparator is limited to between 2 seconds and 5 seconds.